BIOLOGY
STRUCTURE OF PROTEINS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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20%
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30%
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40%
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60%
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Detailed explanation-1: -The total of both is 40%. From 100 remains 60% which is divided equally between guanine and cytosine, so each is 30%.
Detailed explanation-2: -If a cell contains 20% guanine, it will contain 30% adenine. According to Chargaff’s rules, %G = %C and %A = %T. The bases G and C are complementary and are always equal in amount in double-stranded DNA.
Detailed explanation-3: -Since cytosine and guanine are always present in equal numbers, the percentage of guanine molecule is 30%.
Detailed explanation-4: -Hence their numbers in the DNA strand will be equal. Similarly, the purine Guanine pairs with the pyrimidine Cytosine with the help of 3 hydrogen bonds. Hence if a DNA has 20% cytosine, then the amount of guanine will be the same i.e. 20%.
Detailed explanation-5: -A+T = 100-40 =60, Adenine percent= 60/2= 30.